40:8 The grass withers, the flower fades; but the word of our God stands forever.”
The only two reasons God would allow the Bible to be changed would be if he were not powerful enough to protect it, or if he did not care.
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Q1: Is it accepted that the Word of God is eternal and unchangeable? (Lev-i Mahfuz)
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Q22: After God has sent a Holy Book would He ever later feel the need to annul or abrogate some of its verses? (Mensuh & Nesih)
The history of the Quran when explained by most Muslims is fairly straightforward. The Muslim sources however tell a story that is far from simple and raises doubt over its reliability.